Sections of strings or arrays and concrete types

[stevengj]

@tim.holy

All that’s true, but anyone playing with SnoopCompile has a goal to reduce latency. In such cases, there are reasons to limit signatures. This is just a glorified version of this style guide tip and one of many tricks for reducing latency.

But as you point out in the style guide, this is a function of what arguments you pass, not of what arguments you declare in the method definition, though narrowing the definition temporarily could help you catch such call sites.

I generally consider overly narrow declarations to be an anti-pattern in Julia that most new Julia programmers fall prey to instinctively; writing generic code is hard but extremely useful.